太平洋年代际振荡对冬季北半球两大洋风暴轴协同变化的可能影响
投稿时间:2018-10-15  修订日期:2019-05-20  点此下载全文
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朱伟军 南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心 weijun@nuist.edu.cn 
曹煜晨 南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心  
李天宇 吉林省气候中心  
祁春娟 南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:利用NCEP/NCAR和NOAA提供的再分析资料,分析PDO不同位相的年代际背景下北半球海气耦合关系的异常与风暴轴协同变化的联系,结论如下:(1)太平洋年代际振荡与冬季北半球两大洋风暴轴协同变化之间存在显著的相关关系,当PDO暖位相时,对应两大洋风暴轴南北位置反向的异常变化,其中北太平洋风暴轴偏南且中东部减弱,北大西洋风暴轴偏北且中东部增强,PDO冷位相时相反。(2)PDO为暖位相时,对应El Nino型海温异常,北大西洋海温呈三极型,平均槽脊加强,经向环流增强,极涡收缩,北太平洋风暴轴南压,大西洋风暴轴则北抬,此时欧亚大陆北部和北美大陆大部分地区温度异常升高,亚洲南部、非洲北部及巴伦支海以北的高纬温度异常降低,北美西南部和格陵兰岛附近温度也为异常降低。PDO冷位相时相反。
中文关键词:风暴轴  协同变化  太平洋年代际振荡(PDO)  海气耦合
 
The Possible Influence of the Pacific Decadal Oscillation on the Concurrent Variations of the Northern Atlantic and Pacific Storm Tracks during Boreal Winter
Abstract:Based on the reanalysis data of NCEP/NCAR and NOAA, the relationship between the anomaly of air-sea coupling in the northern hemisphere and the synergistic change of storm tracks in the interdecadal background of different PDO phases is analyzed. The results are summarized as follows: (1) There is a significant correlation between the interdecadal oscillation of the Pacific Ocean and the synergistic variations of the storm tracks over the northern hemisphere in winter. When PDO is in warm phase, it corresponds to the anomalous variation of the northern and southern positions of the two oceanic storm tracks. The North Pacific storm tracks are southerly and the central and eastern parts are weakened, and the North Atlantic storm tracks are enhanced in the north-central part of the north. The current variations of the two storm tracks were opposite when PDO is in cold phase. (2) When PDO is in warm phase, it corresponds to El Nino SST anomaly, and the North Atlantic SST is tri-polar, the mean trough ridge is strengthened, the meridional circulation is strengthened, the polar vortex is contracted, the North Pacific storm tracks are southward, and the Atlantic storm tracks are northward. At this time, temperatures in the northern part of Eurasia and most parts of North America are rising abnormally. Temperatures in southern Asia, northern Africa and North Barents Sea are dropping abnormally. Temperatures in the southwestern part of North America and Greenland are also dropping abnormally. The situations are opposite when PDO is in cold phase.
keywords:storm track  concurrent variation  pacific decadal oscillation(PDO)  atmosphere-ocean coupled system
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